The easiest way to create a podcast is to use software. The recommended
software for creating a pocast is FeedForAll.
If you need audio recording software as well there is a podcasting
bundle. Evaluation versions are available so you can set up
the podcast and make sure the software meets your needs prior to
making a purchase desicision.
There are a number of podcasting
tutorials availabe, along with built in wizards in the software
to make the podcast creation easy.